Roller assembly

ABSTRACT

A roller assembly for a machine that rotates a tire disposed on a vehicle and a method of making a roller assembly. The roller assembly includes a roller having an outer surface and a roller cover removably attached to the outer surface. The roller cover has a first surface that is removably adhered to the outer surface of the roller. Contaminants on a tire may be captured on a second surface of the roller cover that is opposite the first surface and disposed of when the roller cover is periodically removed from the roller.

BACKGROUND OF INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a roller assembly for a machine that rotates a tire disposed on a vehicle and a method of making a roller assembly.

[0003] 2. Background Art

[0004] Rollers are used on vehicle testing and steering alignment equipment such as dynamometers, vehicle roll testers, and toe-set alignment machines. A vehicle is positioned on such equipment so that its tires contact one or more rollers. Friction, heat, and pressure transfer contaminants from the tire to the roller when a tire rotates. These contaminants can include oil, steering fluid, dirt, tire dust, and other particulates. Contaminants accumulate on the outer surface of the roller and can interfere with equipment accuracy and performance. For example, in the case of a toe-set alignment machine accumulated contaminants on the surface of a roller can cause a tire to tilt. Tilting of the tire can result in inaccurate measurements and improper adjustments when attempting to correct misalignment conditions and associated warranty claims.

[0005] Manual cleaning operations are employed to remove contaminants from rollers as a regular maintenance item. Operators scrape the surface of the roller with paint scrappers and also may use chemical solvents to remove contaminants. Scraping is labor intensive and the use of chemical solvents is generally sought to be avoided in industrial facilities if possible.

[0006] Contaminants dislodged from the surface of the roller can infiltrate components such as roller bearings, motors, and gear boxes. These loose contaminants can degrade equipment performance and increase wear, breakdowns, and associated maintenance expenditures. In addition, loose contaminants can accumulate underneath and between rollers, which impairs rotation of the roller and allows contaminants to redeposit on the surface of the roller.

[0007] The present invention is directed to providing a solution to the above problems and others as summarized below.

SUMMARY OF INVENTION

[0008] According to one aspect of the present invention, a roller assembly is provided for a machine that rotates a tire disposed on a vehicle. The roller assembly includes a roller having a cylindrical outer surface and a roller cover removably attached to the roller. The roller cover has a first surface that contacts the outer surface of the roller, a second surface opposite the first surface, a first edge that extends across the outer surface, and a second edge positioned near the first edge when the roller cover is removably attached to the outer surface. Contaminants on a tire may be captured by the second surface and disposed of when the roller cover is periodically removed from the roller.

[0009] An adhesive may be located between at least a portion of the outer surface of the roller and the first surface of the roller cover. The adhesive may be applied to either the outer surface of the roller or the first surface of the roller cover. In one embodiment, the adhesive may be provided in the form of a pressure sensitive layer forming part of the roller cover.

[0010] The first edge and the second edge of the roller assembly may be parallel to each other when the roller cover is attached to the roller. The first edge may be located between the outer surface of the roller and a portion of the first surface adjacent to the second edge When the roller cover is attached to the roller. Alternatively, the first and second edges could be adjacent to each other without overlapping. The roller cover may be made of a polymeric material.

[0011] According to another aspect of the invention, a method for making a roller assembly for vehicle tire equipment is provided. The method is used to facilitate removing contaminants from an outer surface of a roller by providing a removable cover. The method comprises initially placing a first surface of a roller cover against the outer surface of the roller. The roller is then rotated to allow the first surface of the cover to wrap around the circumference of the roller. The roller cover is attached by a removable adhesive to the roller so that it can be easily stripped from the roller after the cover has become contaminated.

[0012] The step of rotating the roller may include attaching a first edge of the roller cover to the roller and attaching a second edge of the roller cover adjacent to the first edge. Alternatively, the step of rotating the roller may include overlapping the second edge and a portion of the first surface of the roller cover over the first edge of the roller cover.

[0013] The step of placing the first surface of the roller cover against the outer surface of the roller may include applying an adhesive to at least a portion of the first surface before placing the first surface against the outer surface. Alternatively, an adhesive may be placed on the outer surface of the roller at a location where the roller cover contacts the roller. The adhesive may be applied to the roller cover only at the first edge and at the second edge to facilitate attachment of the roller cover to the roller so that it may be more easily stripped from the roller.

[0014] According to another aspect of the invention, a machine for rotating a tire disposed on a vehicle is provided that includes at least one roller having an outer surface and is rotatably mounted along a transverse axis. A roller cover is removably attached to at least a portion of the outer surface. Contaminants on a tire are captured on an external surface of the roller cover when the external surface engages the tire. The roller cover is periodically removed from the roller and disposed of when the cover has collected sufficient contaminants. This simple and effective solution results in substantial labor savings and minimizes the use of chemical solvents when compared to prior art approaches.

BRIEF DESCRIPTION OF DRAWINGS

[0015]FIG. 1 is a perspective view of a vehicle on an alignment machine having a roller assembly made in accordance with the present invention.

[0016]FIG. 2 is a plan view of an alignment machine having a plurality of roller assemblies of the present invention.

[0017]FIG. 3 is a perspective view of a roller assembly having an overlapping roller cover made in accordance with one embodiment of the present invention.

DETAILED DESCRIPTION

[0018] Referring to FIG. 1, a vehicle 10 is shown on a machine that rotates a tire. More specifically, the embodiment shown in FIG. 1 is a wheel alignment machine 12. Alternatively, the machine could be a dynamometer, vehicle roll tester, or steering alignment fixture.

[0019] Referring to FIGS. 1 and 2, the alignment machine 12 includes a plurality of roller sets 14. Each roller set 14 includes a first roller assembly 16 and a second roller assembly 18 positioned parallel and spaced from each other. The first roller assembly 16 and second roller assembly 18 may have the same construction and are rotatably attached to a supporting structure located beneath a floor 20 of the alignment machine 12. A slotted plate 22 may be located adjacent to each roller set 14 and includes a first slot 24 providing access to the first roller assembly 16 and a second slot 26 providing access to the second roller assembly 18.

[0020] In a wheel alignment machine, the slotted plate 22 may be movable in vertical direction. Initially, the slotted plate 22 is positioned parallel to and flush with the floor 20 so that the first roller assembly 16 and the second roller assembly 18 do not protrude through the first and second slots 24 and 26, respectively. The vehicle 10 can then be rolled into position on the alignment machine 12 without touching the first or second roller assemblies 16, 18. The vehicle 10 may be positioned on the alignment machine 12 such that each front tire 28 is located above a roller set 14. The slotted plates 22 are then lowered to allow the first roller assembly 16 and the second roller assembly 18 to partially protrude through the first and second slots, 24 and 26, respectively, to contact a front tire 28.

[0021] Similarly, each rear tire 30 of the vehicle 10 may be located above a rear roller 32. A rear slotted plate 34 is lowered to allow the rear roller 32 to partially protrude through a slot 36 in the rear slotted plate 34 and contact a rear tire 30. Slotted plates 22 and 34 may be raised to allow the vehicle to be rolled off the alignment machine 12 after any necessary measurements and/or adjustments are made.

[0022] Referring to FIG. 3, a perspective view of a roller assembly 38 is shown in more detail. The roller assembly 38 includes a cylindrical roller 40 having a generally smooth outer surface 42. Mounting pins 44 are located at a first end 46 and a second end 48 of the roller 40 along a transverse axis 50. The mounting pins 44 rotatably support the roller 40 and allow the roller to rotate about the transverse axis 50.

[0023] A cover 52 has a first surface 54 and a second surface 56 opposite the first surface 54. In one preferred embodiment, the cover 52 is a sheet FassonÂ®2 Mil White Polyester with a pressure sensitive self-adhesive backing. The first surface 54 of the cover 52 contacts the outer surface 42 along the circumference of the roller 40. The cover 52 is disposed on a portion of the outer surface 42 between the first end 46 and the second end 48 of the roller 40. Alternatively, the cover 52 may extend completely across the roller from the first end 46 to the second end 48 of the roller 40.

[0024] The cover 52 has a first edge 58 and a second edge 60. The first edge 58 may be positioned near the second edge 60 after the cover 52 is wrapped around the roller 40. In one preferred embodiment, the first edge 58 is positioned between the outer surface 42 of the roller 40 and the first surface 54 of the cover 52 so that the first edge 58 overlaps the second edge 60 as depicted in FIG. 3.

[0025] The first edge 58 and the second edge 60 may be parallel to each other. Alternatively, the first edge 58 and the second edge 60 may be provided such that they are not parallel to each other. For example, the first edge 58 may be straight and the second edge 60 may have a curved, sawtooth, or wave-like pattern that is not parallel to the first edge 58. The edges may also be aligned so that they extend perpendicular to the ends or may be askew.

[0026] Referring back to FIGS. 1 and 2, the cover 52 may be provided on the first and second roller assemblies, 16 and 18. Alternatively, one of the covers 52 may be provided on any or all of the first roller assembly 16, the second roller assembly 18, or the rear roller 32.

[0027] A method making a roller assembly 38 will now be described. First, contaminants are removed from the outer surface 42 of the roller 40 to reveal a clean, smooth surface of the roller. To install the cover 52, the first surface 54 of the cover 52 is placed against the outer surface 42 of the roller 40. In one preferred embodiment, the first surface of the cover 52 is placed in contact with the outer surface 42 of the roller 40 starting at the first edge 58.

[0028] An adhesive is provided between the outer surface 42 of the roller and the first surface 54 of the cover. The adhesive may be placed on the first surface 54 or on the outer surface 42 of the roller 40. Moreover, the adhesive may be provided on all or a portion of the first surface 54 or the outer surface 42. The adhesive may be pre-applied to the cover 40 as a pressure sensitive adhesive layer or may be manually applied as part of the process.

[0029] Next, the roller 40 is rotated to permit the cover 52 to wrap around the outer surface 42. The cover 52 may be pressed to secure the cover in place as the roller 40 is rotated.

[0030] After the cover 52 is attached to the roller, contaminants may adhere to the second surface 56 of the cover 52. When the cover 52 captures sufficient contaminants it may be replaced. The replacement operation includes peeling the cover 52 away from the outer surface 42 of the roller 40, removing any residual adhesive on the outer surface 42, and installing a new cover 52 as previously described.

[0031] While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention as defined by the following claims. 

1. A roller assembly for a machine that rotates a tire while disposed on a vehicle comprising: a roller having a cylindrical outer surface; and a roller cover removably attached to the outer surface, a first surface in contact with the outer surface, a second surface opposite the first surface, a first edge extending across the outer surface, and a second edge positioned near the first edge when the roller cover is removably attached to the outer surface, wherein contaminants on the tire may be captured on the second surface and disposed of when the roller cover is periodically removed from the roller.
 2. The roller assembly of claim 1 further comprising an adhesive located between at least a portion of the outer surface of the roller and the first surface of the roller cover for removably bonding the roller cover to the roller.
 3. The roller assembly of claim 1 wherein the roller cover further comprises an adhesive layer applied to the first surface.
 4. The roller assembly of claim 3 wherein the adhesive layer is pressure sensitive.
 5. The roller assembly of claim 1 wherein the roller cover is a polymeric material.
 6. The roller assembly of claim 1 wherein the first edge and the second edge are parallel to each other when the roller cover is attached to the roller.
 7. The roller assembly of claim 1 wherein the first edge is located between the outer surface of the roller and a portion of the first surface adjacent to the second edge when the roller cover is removably attached to the roller.
 8. A method for making a roller assembly for vehicle tire equipment comprising: removing contaminants from an outer surface of a roller; placing a first surface of a roller cover against the outer surface; rotating the roller to allow the first surface to wrap around the outer surface along a circumference of the roller; and attaching the roller cover removably to the roller.
 9. The method of claim 8 wherein the step of rotating the cylindrical roller further comprises attaching a first edge of the roller cover to the roller and attaching a second edge of the roller cover next to the first edge.
 10. The method of claim 8 wherein the step of rotating the cylindrical roller further comprises overlapping a portion of the first surface of the roller cover near the second edge over a second surface of the roller cover near the first edge.
 11. The method of claim 8 wherein the step of placing the first surface of the roller cover against the outer surface further comprises applying an adhesive to at least a portion of the first surface before placing the first surface against the outer surface.
 12. The method of claim 8 wherein the step of placing the first surface of the roller cover against the outer surface further comprises placing an adhesive on the outer surface where the roller cover will contact the roller before placing the first surface against the outer surface.
 13. The method of claim 8 wherein the step of placing the first surface of the roller cover against the outer surface further comprises applying an adhesive to the roller cover at the first edge and the second edge to facilitate attachment of the roller cover to the roller.
 14. The method of claim 8 wherein the step of rotating the cylindrical roller further comprises rotating the cylindrical roller one revolution.
 15. A machine for rotating a tire disposed on a vehicle comprising: at least one roller rotatably mounted along a transverse axis and having an outer surface; a roller cover removably attached to at least a portion of the outer surface such that the roller cover does not move relative to the roller; wherein rotation of the roller allows contaminants on the tire to be captured on an external surface of the roller cover when the external surface engages the tire and disposed of when the roller cover is periodically removed from the roller. 